HI Slgraz,
Sorry I missed your post.
Any child, including one who is gifted can have an off day of testing. Have you asked the gifted coordinator at your d's school if there are any alternate paths into the G/T program. Parent observation is a legitimate piece of the puzzle, so they may just be waiting for your to ask and not need any additional testing at all.

Good luck and keep us posted,
Grinity

Coaching available, at SchoolSuccessSolutions.com